For a decade, consumers mostly ignored electronic book devices, which were often hard to use and offered few popular items to read. But this year, in part because of the popularity of Amazon.com's wireless Kindle device, the e-book has started to take hold.

The $359 Kindle, which is slim, white and about the size of a trade paperback, was introduced a year ago. Although Amazon will not disclose sales figures, the Kindle has at least lived up to its name by creating broad interest in electronic books. Now it is out of stock and unavailable until February. Analysts credit Oprah Winfrey, who praised the Kindle on her talk show in October.

The shortage is providing an opening for Sony, which embarked on an intense publicity campaign for its Reader device during the gift-buying season